Patent GB-190814444-A (GB)
Title: Power Filter Press.
Inventor: ALVORD ELISHA HENRY
Filed: 1908-07-07
Granted: 1909-03-04
Abstract: 14,444. Alvord, B. H. July 7. Filter - presses.-Filtercloths cover perforated plates 19<2>, 11<5>, secured respectively to a plunger 19'and the end plate 11 of the frame, the pressure chamber being completed by a cylinder 16 which reciprocates longitudinally to allow of the discharge of the solids. A piston 19 works under hydraulic pressure in a chamber formed by the end plate 11<1> and an annular extension 11<2>. The valve 27, through which the material to be filtered is supplied, and the water inlet and outlet valves are controlled from the shaft 32, from which a 1 s the reciprocating motion of the cylinder 16 is obtained. The shaft 32 by means of a crank and connecting-links oscillates a frame 35 mounted loosely on a shaft 22<1> and carrying a cam spindle 36. The cams reciprocate spring - controlled dogs, one a of which is shown in Fig. 4. When this dog is protruded, it engages with a lug at the end of an arm 44<a> fixed to the shaft 22<1>, and the arm then moves with the frame and communicates its motion by means of cranks 22 and links 23 to the slide blocks 15 of the cylinder 16. A segmental piece 62, fixed to the shaft 22', has a notch 62<3> at its lower end which engages with a pin carried by arms mounted loosely on the shaft 56 and connected by a link 72 to the water-outlet valve. The waterinlet valve is controlled from the shaft 56, and is opened when a second cam-operated dog engages with a lug on an arm 44<d> loosely mounted on the shaft 22'. The arm 44<d> then moves rearwards with the carrier, and a shoulder 59<2> on a bar 59 contacts with a block 58 on a lever arm 57 and turns the shaft. The valve is closed by means of an arm operated in a similar manner to the arm 44<d> The valve 27 is controlled by means of a rod 29, the end of which is carried by rollers 30 moving on curved guides 31<1> and has lugs 29', 29<3> engaged at the proper time by dogs protruded by additional cams on the spindle 36. In order that the spindle 36 may receive an intermittent motion, it is provided with a ratchet-wheel 46, Fig. 7, having two sets of teeth 46<1>, 46<2> engaged respectively by pawls 47, 47<1> on a sliding piece 48. A rod 49 connects the piece 48 to a point eccentric of the shaft 22<1> so that the piece is moved inwards and outwards as the carrier frame oscillates. To secure that the period of rest for the spindle 36 shall be lengthened when the charge is under the greatest compression, one pair of each of the sets of teeth 46', 46<2> is spaced farther apart than the others. A bush 54, Fig. 10, having a ratchet-wheel 51<1> adjustably fixed to it, is mounted loosely on the spindle 36 and normally rotates with it, a pin 46<3> projecting from the wheel 46 and pushing against a finger 54<1> on the bush. When the pawls 47, 47<1> cease to act, the wheel 51<1> receives a comparatively slow step-motion from another pawl on the piece 48, until a stop 51<2> in a groove on the wheel 51<1> engages the pin 46<3>. In this position a fourth pawl on the piece 48 engages with a notch in a lug attached to the wheel 51<1> and sharply rotates the spindle 36 to bring the pawls 47, 47<1> again into play. The plunger 19<1> is moved backwards by the cylinder 16, which engages with adjustable studs 20<1> on lugs 20. At the end of the stroke the lugs are caught by the hooked ends of levers 21<1>, so that the plunger is retained when the cylinder moves forwards. The hooks are afterwards released by the cranks 22. When the cylinder 16 retires, the solid cake is knocked away by an ejector 66 oscillated by means of lugs and collars on bars 68 attached to the cylinder. The piston 19 and plunger 19<1> are made separable, and rings are interposed to regulate the distance between them.